CN109609720A - Converter dry dedusting micro-differential pressure control method and device and converter dry dedusting system - Google Patents
Converter dry dedusting micro-differential pressure control method and device and converter dry dedusting system Download PDFInfo
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- CN109609720A CN109609720A CN201910008240.9A CN201910008240A CN109609720A CN 109609720 A CN109609720 A CN 109609720A CN 201910008240 A CN201910008240 A CN 201910008240A CN 109609720 A CN109609720 A CN 109609720A
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- 238000000034 method Methods 0.000 title claims abstract description 92
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000003546 flue gas Substances 0.000 claims abstract description 106
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 80
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 80
- 239000001301 oxygen Substances 0.000 claims abstract description 80
- 230000008569 process Effects 0.000 claims abstract description 57
- 238000007664 blowing Methods 0.000 claims abstract description 48
- 239000000428 dust Substances 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims description 32
- 238000002309 gasification Methods 0.000 claims description 27
- 238000012545 processing Methods 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 20
- 238000010276 construction Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 15
- 238000012986 modification Methods 0.000 claims description 14
- 230000004048 modification Effects 0.000 claims description 14
- 238000005453 pelletization Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 238000005457 optimization Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 239000003034 coal gas Substances 0.000 abstract description 14
- 238000011084 recovery Methods 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 15
- 238000004064 recycling Methods 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 235000019504 cigarettes Nutrition 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009514 concussion Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a converter dry dedusting micro-differential pressure control method, a converter dry dedusting micro-differential pressure control device and a converter dry dedusting system, wherein the converter dry dedusting micro-differential pressure control method comprises the steps of detecting whether a blowing signal exists or not, acquiring an oxygen content value and a CO content value in flue gas in real time when the blowing signal exists, and judging the dedusting process according to the oxygen content value and the CO content value; and when the dust removal process is judged to be in the blowing earlier stage, outputting the earlier stage control value as a target output value to the frequency converter, and when the dust removal process is judged to be in the recovery stage, outputting the recovery stage control value as the target output value to the frequency converter, and controlling the operation of the induced draft fan by the frequency converter according to the target output value. The converter dust removal process is divided into two control stages, namely a blowing early stage and a recovery stage, each stage is pertinently used for furnace mouth micro-differential pressure control, the robustness is high, the fluctuation of the furnace mouth micro-differential pressure within a set value of +/-30 Pa can be well realized, and the purpose of stable, high-quantity and high-quality coal gas recovery is achieved.
Description
Technical field
The present invention relates to iron and steel metallurgical industry technical field of electric control more particularly to a kind of converter dry dedusting differential pressures
Control method, device and converter dry dust pelletizing system.
Background technique
Converter coal gas dry-process purifying recovery process (LT method) high dust collection efficiency, energy-saving effect is significant, is that advanced converter removes
Dirt purification process also becomes the developing direction of converter dust-removing technique.Pneumatic steelmaking uses top blowing oxygen smelting process substantially, whole
In a blowing period, the exhaust gas volumn, flue-gas temperature and flue gas composition of generation are bessemerized with converting process in cyclically-varying,
Oxidation reaction in convertor steelmaking process does not carry out equably, in the different moments of blowing one heat steel, with oxidation of coal
The variation of speed, the furnace gas amount and composition of fumes of bath discharge also constantly change, and furnace gas temperature then becomes with shop pond temperature change
Change.
Air imbibed quantity is mainly influenced by movable gas hood and the size and fire door micro-pressure-difference in fire door gap.When furnace internal pressure
When power is greater than environment atmospheric pressure, the coal gas of converter generated in steelmaking process can be spilt into outside furnace, on the one hand reduce coal gas
On the other hand yield can pollute furnace external environment, damage equipment.When furnace pressure is less than atmospheric pressure, it is easy to draw
Hair large quantity of air, which is inhaled into converter, generates a large amount of CO with CO burning2, reduce the calorific value of coal gas.Converter mouth elementary errors is voltage-controlled
The purpose of system is to maintain converter fire door micro-positive pressure, does not suck air from fire door as far as possible in converting process, causes oxygen content
Exceeded or second-time burning guarantees the high heating value high-recovery of recycling.
Existing converter dry dedusting differential pressure control means are substantially traditional PID adjustment, by changing frequency conversion fan
Revolving speed realizes recycling control, and since differential pressure test point is located above fire door petticoat pipe, and air-introduced machine is located at electrostatic precipitation outlet, in
Between distance have hundreds of meters it is remote, and the generation of converting process furnace gas is nonlinear change, so converter dry dedusting differential pressure
Control belongs to large dead time, big time-varying, and complex nonlinear controls, and traditional PID adjustment easily causes the lag and concussion of control.
Summary of the invention
The purpose of the present invention is to provide a kind of converter dry dedusting differential pressure control method, device and converter dry dedustings
System, it is intended to solve the problem of the lag and concussion that traditional PID adjustment be easy to cause differential pressure to control in the prior art.
The embodiment of the invention provides a kind of converter dry dedusting differential pressure control methods, comprising:
It has detected whether blowing signal, when having detected blowing signal, has obtained the oxygen content value and CO in flue gas in real time
Content value；
When judging that dust collecting process is in Primary period, then export beforehand control value as target output value to frequency conversion
Device is then exported using payoff period controlling value CV2 as target output value to frequency conversion when judging that dust collecting process is in payoff period
Device, the frequency converter control the operation of air-introduced machine according to the target output value；
Wherein, differential pressure measured value of the beforehand control value according to acquisition, preset differential pressure setting value, the petticoat pipe
Signal, the blowing signal are calculated；The payoff period controlling value CV2 is according to flue gas flow measured value, flue gas flow function
It is calculated with amendment component.
In addition, additionally providing a kind of elementary errors pressure control device in the embodiment of the present invention, including before stage selection module, blowing
Phase processing module and payoff period processing module, the Primary period processing module are connect with the stage selection module, and described time
Receipts phase processing module is connect with the stage selection module,
The stage selection module when for having detected blowing signal, obtains the oxygen content value and CO in flue gas in real time
Content value, and blowing stage locating for converter, the blowing stage packet are judged according to the oxygen content value and CO content value that get
Primary period and payoff period are included, and for obtaining the beforehand control value simultaneously when judging that dust collecting process is in Primary period
It is exported the beforehand control value CV1 as output valve, when judging that dust collecting process is in payoff period, obtains payoff period control
Value CV2 is simultaneously then exported the payoff period controlling value CV2 as output valve；
The Primary period processing module obtains differential pressure measured value for when having detected petticoat pipe signal, and according to
Control early period is calculated in the differential pressure measured value of acquisition, preset differential pressure setting value, the petticoat pipe signal, the blowing signal
Value CV1 processed；
The payoff period processing module, for being calculated according to flue gas flow measured value, flue gas flow function and amendment component
Obtain payoff period controlling value CV2.
In addition, the present invention also provides a kind of converter dry dust pelletizing system, including converter, gasification cooling stack, oxygen rifle, cigarette
Cover, flow detection meter, air-introduced machine and composition detection instrument and micro-pressure-difference control device as described above, the converter face the gas
Change the entrance setting of cooling stack, the petticoat pipe is set to the entrance of the gasification cooling stack, and the oxygen rifle turns close to described
Furnace setting, and the gasification cooling stack is inserted into one end of the oxygen rifle, the micro-pressure-difference control device is close to oxygen rifle and described
Petticoat pipe is arranged and is connected to the leading portion of the gasification cooling stack, and the flow detection meter, the air-introduced machine are set in turn in institute
State the back segment of gasification cooling stack, and entrance setting of the air-introduced machine far from the gasification cooling stack, the composition detection
Instrument is used to detect the oxygen content and CO content from the flue gas that the air-introduced machine is blown out, and the flowmeter is for measuring the gasification
Flue gas flow in cooling stack, the micro-pressure-difference control device and the flowmeter and the air-introduced machine, the composition detection
Instrument connection.
Based on the above-mentioned technical proposal, compared with prior art, the converter dry dedusting differential pressure that the embodiment of the present invention proposes
Control method, by the objective law changed according to flue gas during bessemerizing according to duration of blast, in conjunction with actual condition structure
Make flue gas flow function curve, the amendment point that the auxiliary correction algorithm through feedforward Multimode Control and micro-differential pressure is corrected
Converter recycling differential pressure control process is divided into two stages of Primary period and payoff period by amount, and each stage specific aim carries out furnace
The control of mouthful differential pressure, robustness is high, can realize that micro-differential pressure fluctuates within setting value ± 30Pa well, reach stablize,
The purpose of a large amount, high-quality coal-gas recovering.
Detailed description of the invention
Fig. 1 is the process signal of the first embodiment of the converter dry dedusting differential pressure control method in the embodiment of the present invention
Figure；
Fig. 2 is the process signal of the second embodiment of the converter dry dedusting differential pressure control method in the embodiment of the present invention
Figure；
Fig. 3 is the process signal of the 3rd embodiment of the converter dry dedusting differential pressure control method in the embodiment of the present invention
Figure；
Fig. 4 is the S12 in the first embodiment of the converter dry dedusting differential pressure control method in the embodiment of the present invention
Refined flow chart；
Fig. 5 is the structural schematic diagram of elementary errors pressure control device in the embodiment of the present invention；
Fig. 6 is the system composition schematic diagram of the converter dry dust pelletizing system in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or it may be simultaneously present centering elements.When an element is known as " being connected to " another element, it can be with
It is directly to another element or may be simultaneously present centering elements.
It is only phase each other in addition, it should also be noted that, positional terms such as left and right, upper and lower in the embodiment of the present invention
It is reference to concept or with the normal operating condition of product, and should not be regarded as restrictive.Below in conjunction with tool
Realization of the invention is described in detail in body embodiment.
The embodiment of the present invention proposes a kind of converter dry dedusting differential pressure control method, and converter provided in this embodiment is dry
Method dedusting differential pressure control method is applied to the differential pressure in converter dry dust pelletizing system 1, especially converter dry dust pelletizing system 1
Control device 100.As shown in fig. 6, converter dry dust pelletizing system 1 includes converter 13, gasification cooling stack 10, oxygen rifle 11, petticoat pipe
12, flow detection meter 16, air-introduced machine 17, composition detection instrument 18 and micro-pressure-difference control device 100, converter 13 is in face of the cooling cigarette that gasifies
The entrance in road 10 is arranged, and petticoat pipe 12 is set to the entrance of gasification cooling stack 10, and oxygen rifle 11 is arranged close to converter 13, and oxygen rifle 11
One end insertion gasification cooling stack 10, for gasification cooling stack 10 in be blown into oxygen.Micro-pressure-difference control device 100 is close
Oxygen rifle 11 and petticoat pipe 12 are arranged and connect with the leading portion of gasification cooling stack 10, and flow detection meter 16, air-introduced machine 17 are set gradually
In the back segment of gasification cooling stack 10, and entrance setting of the air-introduced machine 17 far from gasification cooling stack 10, composition detection instrument 18 are used
In detecting oxygen content and CO content from the flue gas that air-introduced machine 17 is blown out, flowmeter is for measuring in gasification cooling stack 10
Flue gas flow, elementary errors pressure control device 100 are connect with flowmeter, air-introduced machine 17, composition detection instrument 18.
As shown in Figure 1, the flow diagram of the first embodiment of converter dry dedusting differential pressure control method of the present invention, packet
Include following steps:
S11: having detected whether blowing signal DI_O, when having detected blowing signal DI_O, obtains in flue gas in real time
Oxygen content value AIA_O2 and CO content value AIA_CO, and dedusting work is judged according to oxygen content value AIA_O2 and CO content value AIA_CO
Stage locating for skill；
In the present embodiment, executing subject is elementary errors pressure control device 100.After the completion of converter 13 charges, oxygen rifle 11 drops to
Oxygen blast point starts oxygen blast and discharges blowing signal DI_O, and elementary errors pressure control device 100 detects blowing signal DI_O, elementary errors at this time
Pressure control system starts to put into operation.After the high temperature converter gas generated in converting process is by the gasification cooling of cooling stack 10,
Devaporizer 14 into gasification cooling stack 10.Devaporizer 14 is right by steam (nitrogen) spraying cooling flue gas
Flue gas is further cooled down, while carrying out rough dedusting technique to flue gas.The flue gas of rough dedusting technique enters the cooling cigarette of gasification
After electrostatic precipitator 15 in road 10, further refined dedusting technique and cooling are completed.Flue gas after refined dedusting technique is through overcurrent
After amount detection meter 16 and air-introduced machine 17, through the oxygen content and CO content in 18 real-time detection flue gas of composition detection instrument, flue gas is obtained
In oxygen content value AIA_O2 and CO content value AIA_CO.When differential pressure system detection to blowing signal DI_O after, from sorting
It surveys in instrument 18 and obtains oxygen content value AIA_O2 and CO content value AIA_CO in real time.
In the present embodiment, flue gas de-dusting process is divided into two stages of Primary period and payoff period.Through composition detection instrument
After 18 detect oxygen content and CO content in flue gas, sentenced by the oxygen content value AIA_O2 and CO content value AIA_CO got
Stage locating for disconnected dust collecting process.It is understood that the outlet end of 13 dry-dedusting system of converter is connect with switching station, work as cigarette
When oxygen content value AIA_O2 and CO content value AIA_CO reach recycling condition in gas, the valve by switching switching station to recycle
Cup valve 20 is opened and release cup valve 19 is closed, and flue gas is sent into gas cooler 21, when what gas cooler 21 exported produces coal
When temperature reaches setting condition, the coal gas in gas cooler 21 is sent to gas chamber, with for users to use.When oxygen contains in flue gas
When magnitude AIA_O2 and CO content value AIA_CO is unsatisfactory for recycling condition, that is, it is in Primary period, by the valve for switching switching station
Door closes recovery cup valve 20 and diffuses the opening of cup valve 19, and coal gas is emitted into atmosphere after igniter is burnt.
S12: when judging that dust collecting process is in Primary period, then beforehand control value CV1 is defeated as target output value
It is then exported out using payoff period controlling value CV2 as target output value to frequency converter when judging that dust collecting process is in payoff period
To frequency converter, the frequency converter controls the operation of air-introduced machine 17 according to the target output value；
Wherein, the beforehand control value CV1 according to the differential pressure measured value PV2 of acquisition, preset differential pressure setting value Sp,
The petticoat pipe signal DI_YZ, the blowing signal DI_O are calculated；The payoff period controlling value CV2 is surveyed according to flue gas flow
Magnitude PV1, flue gas flow function SP_YQ and amendment component are calculated.
Elementary errors pressure control device 100 is arranged close to 13 fire door of converter, and the differential pressure at 13 crossing of converter obtains differential pressure measurement
Value PV2 can also detect the petticoat pipe signal DI_YZ generated at petticoat pipe 12 by elementary errors pressure control device 100.In the present embodiment
In, since Primary period be defined as detecting blowing signal DI_O to meeting recycling condition position.Primary period due to by
The conditions such as low, the silicomanganese element oxide of molten iron temperature limit, and the carbon in molten iron is not aoxidized largely, CO and CO2Content it is lower,
Exhaust gas volumn is less, and elementary errors pressure control device 100 mainly controls fire door in Primary period and sucks air less as far as possible, to reach full as early as possible
Foot recycling condition.Mainly pass through differential pressure measured value PV2, micro-pressure-difference setting value, petticoat pipe signal DI_YZ and blowing letter at this stage
Number DI_O calculates beforehand control value CV1.Payoff period is defined as starting to meet recycling condition until recycling terminates, and is that elementary errors is voltage-controlled
The Main Stage of system.The stage is calculated according to flue gas flow measured value PV1, flue gas flow function SP_YQ and component of cultivating one's moral character
Payoff period controlling value CV2.Wherein, the objective law changed according to flue gas in 13 converting process of converter according to duration of blast, in conjunction with
Actual condition constructs flue gas flow function SP_YQ curve.
The stage locating for dust collecting process is judged by the oxygen content value AIA_O2 and CO content value AIA_CO got, when sentencing
It is disconnected go out dust collecting process when being in Primary period, export beforehand control value CV1 as target output value to frequency converter, when judging
When dust collecting process is in payoff period, export using payoff period controlling value CV2 as target output value to frequency converter, frequency converter is according to mesh
Mark the operation of output valve control air-introduced machine 17.
The technical solution of the present embodiment, it is objective by being changed according to flue gas in 13 converting process of converter according to duration of blast
Rule constructs flue gas flow function SP_YQ curve in conjunction with actual condition, auxiliary repairing through feedforward Multimode Control and micro-differential pressure
The recycling differential pressure control process of converter 13 is divided into two ranks of Primary period and payoff period by the amendment component that normal operation method is corrected
Section, each stage specific aim carry out micro-differential pressure control, and robustness is high, can realize well micro-differential pressure setting value ±
It is fluctuated within 30Pa, achievees the purpose that stabilization, a large amount, high-quality coal-gas recovering.
Fig. 2 is the flow diagram of the second embodiment of converter dry dedusting differential pressure control method of the present invention.Wherein, phase
Further include following steps before step S11, details are as follows than Fig. 1:
S101: petticoat pipe signal DI_YZ and blowing signal DI_O are obtained, according to the petticoat pipe signal DI_YZ of acquisition and institute
It states blowing signal DI_O and is based on the first beforehand control value Z1 of the first preset rules calculating；
S102: differential pressure measured value PV2 and differential pressure setting value Sp is obtained, the differential pressure measured value got is calculated
The difference of PV2 and the differential pressure setting value Sp, and the second beforehand control value Z2 is calculated according to the difference；
S103: by the first beforehand control value Z1 and the second beforehand control value Z2 through add operation obtain it is described before
Phase controlling value CV1.
In the present embodiment, the process that beforehand control value CV1 is calculated includes: petticoat pipe signal DI_YZ according to acquisition
The first preset rules, which are based on, with blowing signal DI_O calculates the first beforehand control value Z1Z1.Specifically, when elementary errors pressure control device
After 100 detect blowing signal DI_O, the first beforehand control value is calculated according to petticoat pipe signal DI_YZ and the first budget rules
Z1Z1.Meanwhile the second beforehand control value Z2 is calculated according to the difference of minute-pressure aberration measurements and micro-pressure-difference setting value, this step passes through
Clipping PID123 is carried out, and the limit output of clipping PID123 determines according to actual conditions, for example takes ± 6%.Then, pass through first
Beforehand control value Z1 and the second beforehand control value Z2 is through add operation beforehand control value CV1.Wherein, according to the first preset rules
The differential pressure control of Primary period requires the Expert Rules formulated, and controlling value is relatively more fixed, but before the blowing of every one heat steel
There are certain variations for phase situation, therefore, calculate second by the difference of differential pressure measured value PV2 and differential pressure setting value Sp
Beforehand control value Z2 combines the first beforehand control value Z1 different with dynamically adapting difference molten steel by the second beforehand control value Z2
Primary period operating condition, reach differential pressure early period control versatility and popularity.
Fig. 3 is the flow diagram of the 3rd embodiment of converter dry dedusting differential pressure control method of the present invention.Wherein, phase
Further include following steps before step S11, details are as follows than Fig. 2:
S104: it is based on preset first modification rule, is set according to the differential pressure of the differential pressure measured value PV2 of acquisition and acquisition
The difference of definite value Sp calculates the first amendment component；
S105: being based on preset second modification rule, is believed according to the charging of the oxygen blow duration value O2_TIME of acquisition, acquisition
Number value JLXH and CO content value AIA_CO calculates the second amendment component；
S106: based on preset construction of function rule, according to the oxygen blast flow value FE_O2 of acquisition and the oxygen blow duration of acquisition
Flue gas flow function SP_YQ is calculated in value O2_TIME, and the flue gas flow function SP_YQ is the parabola that Open Side Down；
S107: according to the first amendment component, the second amendment component, the flue gas flow function SP_YQ and institute
It states flue gas flow measured value PV1 and is calculated and state payoff period controlling value CV2.
After aforementioned blowing commencing signal is detected, the difference dP of differential pressure setting value Sp and differential pressure measured value PV2 are sent
Corrected Calculation module 131, corrected Calculation module 131 are based on the first modification rule and the first amendment component dV1 are calculated, wherein
First modification rule is to combine difference dP to calculate the first amendment component dV1 according to the amendment upper lower limit value that statistical data obtains.
It is set when dP is greater than the dead zone of setting according to difference dP size for example, working as the difference of differential pressure setting value and differential pressure measured value
The linear calculating of slope is determined for example, f (x)=ax+b, is converted to corresponding flue gas compensation rate then to carry out dynamic compensation.Finally
Flue gas compensation rate obeys the bound constraint that corrected Calculation module 131 is set.
Meanwhile oxygen blow duration value O2_TIME, charging signal value JLXH and CO content value signal AIA_CO send Expert Rules mould
Block 134, Expert Rules module 134 calculate the second amendment component dV2 based on the second preset modification rule.Second amendment rule
Then formulated according to Expert Rules, charging event that the liter petticoat pipe 12 and later period mainly for payoff period are affected to flue gas etc. into
Capable additional flue gas correction amount.Specifically, the second modification rule is to judge to blow according to oxygen blow duration and CO changes of contents trend
Period in recycling is in early period, mid-term or later period, according to the charging process of different times to the substantially shadow of flue gas flow
It rings, forms Expert Rules, the fluctuation of the flue gas flow caused by charging carries out empirical compensation.
In addition, being counted based on preset construction of function rule according to oxygen blast flow value FE_O2 and oxygen blow duration value O2_TIME
Calculation obtains flue gas flow function SP_YQ, and flue gas flow function SP_YQ is the parabola that Open Side Down.Wherein, construction of function rule
The flue gas flow function SP_YQ of building is SP_YQ=(- A*O2_TIME^2+B*O2_TIME+C) * S*FE_O2, wherein SP_YQ:
Flue gas flow function SP_YQ；A: two-term coefficient (is greater than 0)；B: Monomial coefficient；C: constant term；S: flue gas coefficient；FE_O2:
Oxygen blast flow；O2_TIME: oxygen blow duration value.According to the rule of parabolic coefficient, Open Side Down parabola, two-term coefficient must
It must be negative value, order of magnitude determines openings of sizes.It can make the flue gas of construction by adjusting the size of coefficient A, B, C, S
Parabola setting generally conforms to practical flue gas, and a situation arises.There are two feasible schemes, first is that finding out certain by historical data
Differential pressure fluctuation meets the flue gas flow trend in constraint section in steel converting process, substantially conforms to the function of construction as reference
This practical flue gas flow trend.Second is that manually adjusting differential pressure by a period of time, selection wherein meets differential pressure constraint condition
Preferable flue gas curve is as the parabolical reference of construction.
Since flue gas flow function SP_YQ can not represent the practical flue gas variation tendency of the every furnace steel of all steel grades, only
The main trend of flue gas variation can be characterized, therefore flue gas flow function SP_YQ is modified according to aforementioned correction amount dV1 and dV2
After obtain payoff period controlling value CV2.
It should be noted that step S101 to step S103 and step S104 to step S107 does not have point of sequencing,
The two carries out simultaneously.
Fig. 4 is the refined flow chart of the S12 of the first embodiment of converter dry dedusting differential pressure control method of the present invention, in detail
It states as follows:
S121: it when judging that dust collecting process is in Primary period, is then exported the beforehand control value CV1 as target
Value, when dust collecting process is in payoff period, then using the payoff period controlling value CV2 as target output value；
S122: obtaining 17 tachometric survey value of feedback PV3 of air-introduced machine, is based on preset no-harass switch rule and the air-introduced machine
17 tachometric survey value of feedback PV3, the target output value convert to obtain setting output valve CV3；
S123: carrying out amplitude limiting processing to the setting output valve and linearization process obtain real output value CV4, will be described
Real output value CV4 is sent to the frequency converter, and the frequency converter controls air-introduced machine 17 according to the real output value CV4
Operation.
In the present embodiment, in order to guarantee the stabilization of differential pressure control and the stabilization of operating condition, switch when by Primary period
When to payoff period, 17 tachometric survey value of feedback PV3 of air-introduced machine is obtained by acquisition 17 revolving speed of air-introduced machine, and be based on 17 turns of air-introduced machine
Speed measurement value of feedback PV3 and preset no-harass switch rule realize no-harass switch.Specifically, measurement of fan speed value of feedback is utilized
PV3 handles payoff period controlling value CV2 or beforehand control value CV1 according to preset no-harass switch rule.For example, when sentencing
When disconnected Primary period terminates to reach recovery stage, enable CV3=CV1, while recording the difference of CV2 and CV1, CV3 switch to CV2 it
Afterwards, flue gas flow control is added using the difference of CV2 and CV1 as delay correction-compensation amount.At this point, according to the difference of CV2 and CV1
Single compensation function f (x)=- Ax+b (A is positive number) is constructed with empirical value, compensation rate size is successively decreased at any time until be zero, from
And realize the no-harass switch in two stages.
Meanwhile in order to avoid blower is frequently in differential pressure control process and fluctuation suddenly causes to smolder, setting is exported
Value CV3 carries out linearisation smoothing processing and amplitude limiting processing obtains real output value CV4, and frequency converter is controlled according to real output value CV4
The operation of air-introduced machine 17 processed.In addition, in order to avoid the too fast or too slow caused coal of the wind speed of the air-introduced machine 17 in dust removal process
Gas explosion is fried with other safety problems, the frequency control range exported for frequency converter provided with frequency conversion.
In addition, in a specific embodiment, judging dedusting work according to oxygen content value AIA_O2 and CO content value AIA_CO
Stage locating for skill include: judge oxygen content value AIA_O2 and CO content value AIA_CO whether and meanwhile meet condition: oxygen content value
AIA_O2 ﹤ 1% and CO content value AIA_CO ﹥ 20%, if oxygen content value AIA_O2 and CO content value AIA_CO simultaneously meet it is above-mentioned
Condition then judges that dust collecting process is in payoff period, if oxygen content value AIA_O2 and CO content value AIA_CO does not meet simultaneously
Condition is stated, then judges that dust collecting process is in Primary period.In other embodiments, specific Rule of judgment is according to the actual situation
Setting, above-described embodiment are only illustrated, and are not the restriction to Rule of judgment.For example, actual recovered condition according to
The weight height of coal gas to CO content value AIA_CO in coal gas and oxygen content value AIA_O2 require can it is low can be high, such as CO content value
AIA_CO is 19%, and oxygen content value AIA_O2 is 1.2%.
Fig. 5 is the structural schematic diagram of elementary errors pressure control device 100 of the present invention, including stage selection module 110, Primary period
Processing module and recovery processing module, Primary period processing module are connect with stage selection module 110, are recycled module and rank
Section selecting module 110 connects,
When stage selection module 110 is for having detected blowing signal DI_O, the oxygen content value in flue gas is obtained in real time
AIA_O2 and CO content value AIA_CO, and converter 13 is judged according to the oxygen content value AIA_O2 and CO content value AIA_CO got
In the locating blowing stage, the blowing stage includes Primary period and payoff period, and is blown for that ought judge that dust collecting process is in
When refining early period, the beforehand control value CV1 is obtained and using the beforehand control value CV1 as output valve output, when judging to remove
When dirt technique is in payoff period, acquisition payoff period controlling value CV2 is simultaneously then defeated as output valve using the payoff period controlling value CV2
Out.
In a specific implementation, stage selection module 110 judges the stage locating for dust collecting process according to following rule: judgement
Whether oxygen content value AIA_O2 and CO content value AIA_CO meets condition simultaneously: oxygen content value AIA_O2 ﹤ 1% and CO content value
AIA_CO ﹥ 20% judges dust collecting process if oxygen content value AIA_O2 and CO content value AIA_CO meets above-mentioned condition simultaneously
Dedusting work is judged if oxygen content value AIA_O2 and CO content value AIA_CO does not meet above-mentioned condition simultaneously in payoff period
Skill is in Primary period.In other embodiments, specific Rule of judgment is set according to actual conditions, above-described embodiment only into
Row is for example, be not the restriction to Rule of judgment.For example, actual recovered condition is according to the weight height of coal gas in coal gas
CO content value AIA_CO and oxygen content value AIA_O2 require can it is low can be high, such as CO content value AIA_CO is 19%, oxygen content value
AIA_O2 is 1.2%.
Primary period processing module, for when having detected petticoat pipe signal DI_YZ, obtaining differential pressure measured value PV2, and
According to the differential pressure measured value PV2 of acquisition, preset differential pressure setting value Sp, the petticoat pipe signal DI_YZ, the blowing signal
Beforehand control value CV1 is calculated in DI_O；
Payoff period processing module, for according to flue gas flow measured value PV1, flue gas flow function SP_YQ and amendment component
Payoff period controlling value CV2 is calculated.
In the present embodiment, pass through the objective law changed according to flue gas in 13 converting process of converter according to duration of blast, knot
It closes actual condition and constructs flue gas flow function SP_YQ curve, the auxiliary correction algorithm through feedover Multimode Control and micro-differential pressure
Obtained amendment component is corrected, the recycling differential pressure control process of converter 13 is divided into two stages of Primary period and payoff period, often
A stage specific aim carries out micro-differential pressure control, and robustness is high, can realize micro-differential pressure in setting value ± 30Pa well
Within fluctuate, achieve the purpose that stabilization, a large amount, high-quality coal-gas recovering.
Further, Primary period processing module include feed expert controller 121, subtracter 124, clipping PID123,
With adder 122, the feed expert controller 121, for obtain blowing signal DI_O and petticoat pipe signal DI_YZ, and according to
The first preset rules, which are based on, according to the petticoat pipe signal DI_YZ of the acquisition and blowing signal DI_O calculates the first beforehand control
Value Z1；The subtracter 124 for obtaining differential pressure setting value Sp and differential pressure measured value PV2, and calculates the differential pressure and surveys
The difference of magnitude PV2 and the differential pressure setting value Sp；The limit PID, for obtaining the second early period of control according to the difference
Value Z2 processed；The adder 122, for transporting the first beforehand control value Z1 and the second beforehand control value Z2 through addition
Calculation obtains the beforehand control value CV1.
Further, the payoff period processing module includes corrected Calculation module 131, flue gas match control module 132, cigarette
Gas sets function construction module 133 and Expert Rules module 134,
The corrected Calculation module 131, for being based on preset first modification rule, according to the differential pressure measured value
The difference of PV2 and the differential pressure setting value Sp calculate the first amendment component；Wherein, the first modification rule is to combine difference dP
The first amendment component dV1 is calculated according to the amendment upper lower limit value that statistical data obtains.For example, working as differential pressure setting value and differential pressure
The difference of measured value, dP be greater than setting dead zone when, according to difference dP size carry out setting slope linear calculating such as f (x)=
Ax+b is converted to corresponding flue gas compensation rate then to carry out dynamic compensation.Final flue gas compensation rate obeys corrected Calculation module
The bound constraint of 131 settings.
The Expert Rules module 134, for being based on preset second modification rule, according to the oxygen blow duration value O2_
TIME, the charging signal value JLXH and the CO content value signal AIA_CO calculate the second amendment component；Specifically, it second repairs
Positive rule is in early period, mid-term is still to judge the period in recycling of blowing according to oxygen blow duration and CO changes of contents trend
Later period, the substantially influence according to the charging process of different times on flue gas flow form Expert Rules, the flue gas caused by charging
Flowed fluctuation carries out empirical compensation.
The flue gas sets function construction module 133, for regular based on preset construction of function, according to the oxygen blast stream
Flue gas flow function SP_YQ is calculated in magnitude FE_O2 and the oxygen blow duration value O2_TIME；Wherein, flue gas flow function
SP_YQ is the parabola that Open Side Down.Wherein, the flue gas flow function SP_YQ of construction of function rule building is SP_YQ=(- A*
O2_TIME^2+B*O2_TIME+C) * S*FE_O2, wherein SP_YQ: flue gas flow function SP_YQ；A: two-term coefficient (is greater than
0)；B: Monomial coefficient；C: constant term；S: flue gas coefficient；FE_O2: oxygen blast flow；O2_TIME: oxygen blow duration value.According to throwing
The rule of object linear system number, Open Side Down parabola, two-term coefficient are necessary for negative value, and order of magnitude determines that opening is big
It is small.The flue gas parabola setting of construction can be made to generally conform to practical flue gas generation feelings by adjusting the size of coefficient A, B, C, S
Condition.There are two feasible schemes, first is that finding out differential pressure fluctuation in certain steel converting process by historical data meets confining region
Between flue gas flow trend, as with reference to make construction function substantially conform to this practical flue gas flow trend.Second is that passing through one section
Time manually adjusts differential pressure, and selection wherein meets the preferable flue gas curve of differential pressure constraint condition as the parabolical ginseng of construction
It examines.
The flue gas match control module 132, for according to the first amendment component, the second amendment component, institute
It states flue gas flow function SP_YQ and the flue gas flow measured value PV1 is calculated and states payoff period controlling value CV2.
Further, elementary errors pressure control device 100 further includes measurement of fan speed feedback module 150 and optimization module 140,
The measurement of fan speed feedback module 150, for monitoring the revolving speed of air-introduced machine 17 and surveying 17 revolving speed of air-introduced machine
Amount value of feedback PV3 feeds back to the stage selection module 110；
The stage selection module 110, for according to the 17 tachometric survey value of feedback PV3 of air-introduced machine and preset unperturbed
Switching law converts to obtain setting output valve CV3 according to target output value；No-harass switch rule, which can be to work as, judges Primary period
Terminate reach recovery stage when, enable CV3=CV1, while recording the difference of CV2 and CV1, after CV3 switches to CV2, by CV2 with
Flue gas flow control is added as delay correction-compensation amount in the difference of CV1.At this point, according to the difference of CV2 and CV1 and empirical value structure
It builds single compensation function f (x)=- Ax+b (A is positive number), compensation rate size is successively decreased at any time until being zero, to realize two
The no-harass switch in stage.
The optimization module 140 carries out amplitude limiting processing and line for obtaining setting output valve CV3, and to setting output valve
Property handles to obtain real output value CV4, and real output value CV4 is sent to frequency converter, is avoided in differential pressure control process
Middle blower is frequently and fluctuation suddenly causes to smolder.
In addition, a kind of converter dry dust pelletizing system 1 provided in an embodiment of the present invention, including converter 13, gasification cooling stack
10, oxygen rifle 11, petticoat pipe 12, flow detection meter 16, air-introduced machine 17, composition detection instrument 18 and micro-pressure-difference control device as described above
100.The connection relationship and technical process of converter dry dust pelletizing system 1 are for example above-mentioned, are not repeating herein.Due to converter dry dedusting
System 1 includes such as aforementioned elementary errors pressure control device 100, therefore converter dry dust pelletizing system 1 has aforementioned differential pressure control dress
100 all beneficial effects are set, this will not be repeated here.
Embodiment described above, the only specific embodiment of the invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent repair
Change, replace and improve etc., these modifications, replacement and improvement should be covered by the protection scope of the present invention.Therefore, this hair
Bright protection scope should be subject to the protection scope in claims.
Claims (10)
1. a kind of converter dry dedusting differential pressure control method, which comprises the steps of:
It has detected whether blowing signal, when having detected blowing signal, has obtained the oxygen content value and CO content in flue gas in real time
Value, and the stage locating for dust collecting process is judged according to oxygen content value and CO content value；
When judging that dust collecting process is in Primary period, then export beforehand control value as target output value to frequency converter,
When judging that dust collecting process is in payoff period, then export payoff period controlling value as target output value to frequency converter, it is described
Frequency converter controls the operation of air-introduced machine according to the target output value；
Wherein, the beforehand control value is believed according to the differential pressure measured value of acquisition, preset differential pressure setting value, the petticoat pipe
Number, the blowing signal is calculated；The payoff period controlling value is according to flue gas flow measured value, flue gas flow function and amendment
Component is calculated.
2. converter dry dedusting differential pressure control method as described in claim 1, which is characterized in that the beforehand control value root
It is calculated, wraps according to the differential pressure measured value of acquisition, preset differential pressure setting value, the petticoat pipe signal, the blowing signal
It includes:
The first preset rules, which are based on, according to the petticoat pipe signal of acquisition and the blowing signal calculates the first beforehand control value；
The difference of the differential pressure measured value got and the differential pressure setting value is calculated, and calculates the according to the difference
Two beforehand control values；
The first beforehand control value and the second beforehand control value are obtained into the beforehand control value through add operation.
3. converter dry dedusting differential pressure control method as claimed in claim 2, which is characterized in that the payoff period controlling value
It is calculated according to flue gas flow measured value, flue gas flow function and amendment component, comprising:
Based on preset first modification rule, first is calculated according to the difference of the differential pressure measured value of acquisition and differential pressure setting value
Correct component；
Based on preset second modification rule, second is calculated according to the oxygen blow duration value of acquisition, charging signal value and CO content value
Correct component；
Based on preset construction of function rule, flue gas flow letter is calculated according to the oxygen blast flow value of acquisition and oxygen blow duration value
Number, the flue gas flow function are the parabola that Open Side Down；
According to the first amendment component, the second amendment component, the flue gas flow function and flue gas flow measurement
Value, which is calculated, states payoff period controlling value.
4. converter dry dedusting differential pressure control method as claimed in claim 3, which is characterized in that described to judge dedusting
It when technique is in Primary period, then exports using the beforehand control value as target output value to frequency converter, when judging dedusting
When technique is in payoff period, then export using the payoff period controlling value as target output value to frequency converter, the frequency converter root
According to the operation of target output value control air-introduced machine, comprising:
When judging that dust collecting process is in Primary period, then using the beforehand control value as target output value, when dedusting work
When skill is in payoff period, then using the payoff period controlling value as target output value.
Air-introduced machine tachometric survey value of feedback is obtained, is fed back based on preset no-harass switch rule and the air-introduced machine tachometric survey
Value, the target output value convert to obtain setting output valve；
Amplitude limiting processing is carried out to the setting output valve and linearization process obtains real output value, the real output value is sent out
It send to the frequency converter, the frequency converter controls the operation of air-introduced machine according to the real output value.
5. converter dry dedusting differential pressure control method according to any one of claims 1 to 4, which is characterized in that and root
The stage locating for dust collecting process is judged according to oxygen content value and CO content value, comprising:
Judge the oxygen content value and the CO content value whether and meanwhile meet condition: oxygen content value ﹤ 1% and CO content value ﹥
20%；
If meeting simultaneously, judge that dust collecting process is in payoff period；
If not meeting simultaneously, judge that dust collecting process is in Primary period.
6. a kind of elementary errors pressure control device, which is characterized in that including stage selection module, Primary period processing module and payoff period
Processing module, the Primary period processing module are connect with the stage selection module, the payoff period processing module with it is described
Stage selection module connection,
The stage selection module when for having detected blowing signal, obtains the oxygen content value and CO content in flue gas in real time
Value, and judge that blowing stage locating for converter, the blowing stage include blowing according to the oxygen content value and CO content value that get
It refines early period and payoff period, and for when judging that dust collecting process is in Primary period, obtaining the beforehand control value and by institute
It states beforehand control value to export as target output value, when judging that dust collecting process is in payoff period, obtains payoff period controlling value
And it is then exported the payoff period controlling value as target output value；
The Primary period processing module, for obtaining differential pressure measured value, and according to acquisition when having detected petticoat pipe signal
Differential pressure measured value, preset differential pressure setting value, the petticoat pipe signal, the blowing signal beforehand control is calculated
Value；
The payoff period processing module, for being calculated according to flue gas flow measured value, flue gas flow function and amendment component
Payoff period controlling value.
7. elementary errors pressure control device as claimed in claim 6, which is characterized in that the Primary period processing module includes feedforward
Expert Controller, subtracter, clipping PID and adder,
The feed expert controller is believed for obtaining blowing signal and petticoat pipe signal, and according to according to the petticoat pipe of acquisition
Number and the blowing signal be based on the first preset rules calculating the first beforehand control value；
The subtracter for obtaining differential pressure setting value and differential pressure measured value, and calculates the differential pressure measured value and institute
State the difference of differential pressure setting value；
The limit PID, for obtaining the second beforehand control value according to the difference；
The adder, for by first beforehand control and the second beforehand control value through add operation obtain it is described before
Phase controlling value.
8. elementary errors pressure control device as claimed in claim 7, which is characterized in that the payoff period processing module includes amendment meter
Module, flue gas match control module, flue gas setting function construction module and Expert Rules module are calculated,
The corrected Calculation module, for being based on preset first modification rule, according to the differential pressure measured value and described micro-
The difference of differential pressure setpoint calculates the first amendment component；
The Expert Rules module is believed for being based on preset second modification rule according to the oxygen blow duration value, the charging
Number value and the CO content value calculate second amendment component；
The flue gas sets function construction module, for based on preset construction of function rule, according to the oxygen blast flow value and
Flue gas flow function is calculated in the oxygen blow duration value；
The flue gas match control module, for according to the first amendment component, the second amendment component, the flue gas stream
Flow function and the flue gas flow measured value are calculated and state payoff period controlling value.
9. elementary errors pressure control device as claimed in claim 8, which is characterized in that further include measurement of fan speed feedback module and
Optimization module,
The measurement of fan speed feedback module, for monitoring the revolving speed of air-introduced machine and feeding back air-introduced machine tachometric survey value of feedback
To the stage selection module；
The stage selection module, for according to the air-introduced machine tachometric survey value of feedback and preset no-harass switch rule, root
It converts to obtain setting output valve according to target output value；
The optimization module is obtained for obtaining setting output valve, and to setting output valve progress amplitude limiting processing and linearization process
To real output value, real output value is sent to frequency converter.
10. a kind of converter dry dust pelletizing system, which is characterized in that including converter, gasification cooling stack, oxygen rifle, petticoat pipe, flow inspection
Survey meter, air-introduced machine and composition detection instrument and the micro-pressure-difference control device as described in any one of claim 5 to 8, the converter
In face of the entrance setting of the gasification cooling stack, the petticoat pipe is set to the entrance of the gasification cooling stack, the oxygen rifle
It is arranged close to the converter, and the gasification cooling stack is inserted into one end of the oxygen rifle, the micro-pressure-difference control device is close
Oxygen rifle and the petticoat pipe setting and with it is described gasification cooling stack leading portion be connected to, the flow detection meter, the air-introduced machine according to
The secondary back segment for being set to the gasification cooling stack, and entrance setting of the air-introduced machine far from the gasification cooling stack, institute
Composition detection instrument is stated for detecting oxygen content and CO content from the flue gas that the air-introduced machine is blown out, the flowmeter is for surveying
Measure the flue gas flow in the gasification cooling stack, the micro-pressure-difference control device and the flowmeter and the air-introduced machine, institute
State the connection of composition detection instrument.
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| CN201910008240.9A CN109609720B (en) | 2019-01-04 | 2019-01-04 | Converter dry dedusting micro-differential pressure control method and device and converter dry dedusting system |
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| CN111944944A (en) * | 2020-06-30 | 2020-11-17 | 西安西矿环保科技有限公司 | Coal gas recycling maximization control method and system of converter coal gas fan |
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